dynamic更新图表图表的值
我使用chartjs创build了一个基本的条形图，它工作正常。 现在我想要更新基于时间间隔的值。 我的问题是，我创build图表后，我不知道如何正确更新其值…
我的代码：
var ctx = $("#myChart").get(0).getContext("2d"); var dts = [ { fillColor: "rgba(220,220,220,0.5)", strokeColor: "rgba(220,220,220,1)", data: [0, 0, 0, 0, 0] } ]; var data = { labels: ["Core#1", "Core#2", "Core#3", "Core#4", "Total"], datasets: dts }; var chart = new Chart(ctx); chart.Bar(data); //test code setInterval( function () { data.datasets[0].data = [random(), random(), random(), random(), random()]; chart.Bar(data); },2000); 在testing代码中，我用datasets[0].data更新值 – 这是正确的方法吗？ 这个问题是每次我调用chart.Bar() ，值被重置为0，然后animation到随机值（如我重新创build图表）。 这样，所有animation总是从0到看起来很奇怪的值。 我会期望，如果我更新一个值从50到10，酒吧会从50下降到10，而不是设置为0，然后animation到10。
我没有发现任何关于这个文件…我做错了什么或这是不可能的这个图书馆？
更新：看起来像charjs已经更新（见下面的评论）。 有一些例子看起来很不错：
- 以下是使用新数据更新折线图的示例： http : //jsbin.com/yitep/5/edit
- 以下是我们如何更新折线图上的现有数据： http : //jsbin.com/yitep/4/edit
原始post
截至2013年11月，似乎没有更新图表的选项。
这里有一个很好的例子 （下面重复）向折线图添加新的点。 仍然有点跳动，但不是太糟糕。 不过，我认为效果可能取决于您使用的图表。
它看起来像是在开发渠道的某个地方。 我没有看到发布date的任何迹象，但： https : //github.com/nnnick/Chart.js/issues/13
JS
$(document).ready(function(){ var count = 10; var data = { labels : ["1","2","3","4","5", "6", "7", "8", "9", "10"], datasets : [ { fillColor : "rgba(220,220,220,0.5)", strokeColor : "rgba(220,220,220,1)", pointColor : "rgba(220,220,220,1)", pointStrokeColor : "#fff", data : [65,59,90,81,56,45,30,20,3,37] }, { fillColor : "rgba(151,187,205,0.5)", strokeColor : "rgba(151,187,205,1)", pointColor : "rgba(151,187,205,1)", pointStrokeColor : "#fff", data : [28,48,40,19,96,87,66,97,92,85] } ] } // this is ugly, don't judge me var updateData = function(oldData){ var labels = oldData["labels"]; var dataSetA = oldData["datasets"][0]["data"]; var dataSetB = oldData["datasets"][1]["data"]; labels.shift(); count++; labels.push(count.toString()); var newDataA = dataSetA[9] + (20 - Math.floor(Math.random() * (41))); var newDataB = dataSetB[9] + (20 - Math.floor(Math.random() * (41))); dataSetA.push(newDataA); dataSetB.push(newDataB); dataSetA.shift(); dataSetB.shift(); }; var optionsAnimation = { 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HTML
<html> <head> <script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script> </head> <body> <h1>Live Updating Chart.js</h1> <canvas id="myChart" width="400" height="150"></canvas> </body> </html>
根据文档，现在有一个update（）方法将重新绘制图表。
.update（）
在您的Chart实例上调用update（）将使用任何更新的值重新渲染图表，从而允许您编辑多个现有点的值，然后在一个animation渲染循环中渲染这些值。
myBarChart.datasets[0].bars[2].value = 50; // Would update the first dataset's value of 'March' to be 50 myBarChart.update(); // Calling update now animates the position of March from 90 to 50.
你也可以使用destroy（）函数。 喜欢这个
if( window.myBar!==undefined) window.myBar.destroy(); var ctx = document.getElementById("canvas").getContext("2d"); window.myBar = new Chart(ctx).Bar(barChartData, { responsive : true, });
以下是ChartJs最新版本的操作方法：
setInterval(function(){ chart.data.datasets[0].data[5] = 80; chart.data.labels[5] = "Newly Added"; chart.update(); }
看这个清晰的video
或者在jsfiddle中testing它
删除canvasdom并再次添加。
function renderChart(label,data){ $("#canvas-wrapper").html("").html('<canvas id="storeSends"></canvas>'); var lineChartData = { labels : label, datasets : [ { fillColor : "rgba(49, 195, 166, 0.2)", strokeColor : "rgba(49, 195, 166, 1)", pointColor : "rgba(49, 195, 166, 1)", pointStrokeColor : "#fff", data : data } ] } var canvas = document.getElementById("storeSends"); var ctx = canvas.getContext("2d"); myLine = new Chart(ctx).Line(lineChartData, { responsive: true, maintainAspectRatio: false }); }
我认为现在不可能。
不过这个function应该会很快出现，正如作者在这里暗示的那样： https : //github.com/nnnick/Chart.js/issues/161#issuecomment-20487775
如果destroy（）和clear（）不工作（就像我有经验），你可以使用jquery删除canvas，并再次追加它。
$('#chartAmazon').remove(); $('#chartBar').append('<canvas id="chartAmazon"></canvas>'); var ctxAmazon = $("#chartAmazon").get(0).getContext("2d"); var AmazonChart = new Chart(ctxAmazon, { type: 'doughnut', data: dataAmazon, options: optionsA });
chartObject.data.datasets = newData.datasets; chartObject.data.labels = newData.labels; chartObject.update();
很简单，只需要replace图表canvas元素。
$（'＃canvas'）。replaceWith（'id =“canvas”height =“200px”width =“368px”>'）;
